Smoke-preventing and fuel-saving device for boiler or other furnaces.



'Nn 694,|47. Patantad 'rab.;25, :902.

. a. GREGORY. a SMOKE- PBEVENTING AND FUEL SAVING DEVICE FOR BOILER OROTHER FURNACES.

(Application filed A 9, 1991 2 Sheets-Sheet L No. 694,147. Patented Feb.25, I902.

-G. GREGORY. SMOKE PREVENTING AND FUEL SAVING DEVICE FOR BOILER OR OTHERFURNACES.

(Applicatien filed Apr. 9, 1901.)

2 Sheets-Sheet 2:

(No Model.)

ATTORNEYS.

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UNITED STATES PATENT OFFICE- GEORGE GREGORY, OF LONDON, ENGLAND,ASSIGNOR OF TWO-TI-IIRDS TO ROBERT GREGORY, OF ISLINGTON, LONDON,ENGLAND, AND JOHN HENRY FOSTER, OF GREENWICH, ENGLAND.

SMOKE-PREVENTlNG AND FU-ELSAVING DEVICE FOR BOlLER OR OTHER FURNACES.

SPECIFICATION forming part of Letters Patent No. 694,147, dated February25, 1902. Application filed April 9, 1901. Serial No. 55, (N modem T0 towhom, it may concern:

Be it known that I, GEORGE GREGORY, mechanical engineer, a subject ofHis Majesty King Edward VII of Great Britain, and a resident of 57Victoria road, Kentish Town, London, N. W., England, have inventedcertain new and useful Smoke-Preventing and Fuel- Saving Devices forBoiler or other Furnaces, (for which I have made application for patincut in Great Britain, No. 23,099, bearing date December 18, 1900,) ofwhich the following is a specification.

My invention relates to a device or apparatus adapted for attachment tothe furnace of any type of steam-boiler as a means for providing aninduced current of air and steam, which is caused to impinge directlyover and upon the fire, and by thereat mixing with the carbonaceousgases of the fur- 2'0 nace a perfect combustion ensues and the issue ofsmoke from the uptake-shaft is entirely prevented-a desideratum onoceangoing vessels and in factories having a short uptake-shaft incrowded neighborhoods.

My invention consists of an inner casing or shield-plate fixed upon theinner surface of the furnace-front in such a manner as to form a chamberabove and partly around the furnace-door opening, the said chamber beingprovided with suitable holes, apertures,

or grids or gratings open to the atmosphere and through which air isadmitted into the said chamber. Asuitable inlet or retort pipe or pipesis or are fitted communicating with and leading from the saidair-chamber into the furnace above and directed toward the fire, a smalland cock-governed steam pipe or pipes communicating with the boilerabove the water-level, being led therefrom to a specially-constructednozzle in the center of the said inlet or retort pipe or pipes in theairchamber and through which and the said inlet pipe or pipes steam isconveyed, which induces a strong current of air to be drawn through thesaid apertures in the furnacefront into the said air-chamber, which,mingling with the current of steam, causes a superheated current orwater-gas to be driven almost noiselessly through the said inlet orretort pipe or pipes directly onto the furnacefire,which in practice hasbeen found to bring about the perfect combustion of all the va-' riousgases generated in the furnace.

In order that my said invention and the 'manner in which I purposeemploying the plication to three types of boilers, which will suffice tomake clear the manner of using my invention in connection with othertypes of boilers. (Not shown.)

Figure 1 is an elevation of the front end of a two-furnace or Lancashireboiler to which my invention has been applied. Fig. 2 is a verticallongitudinal section of a boiler which must be regarded as taken throughone of the furnaces of such a boiler, as Fig. 1, or through the furnaceof a Cornish or like boiler. Fig. 3 is a much-enlarged sectional View ofthe improved nozzle (forming part of my invention) and the inlet orretort pipe of the airchamber through which the compound current isdirected onto the furnace-fire, Fig. 4 being an end View of the saidnozzle with the steam-passage thereof in section.

My invention consists of easing or shieldplate A, fixed upon the innerface of the boilerfront B, thus forming an air-chamber, the shape andconfiguration of the said chamber being such as to partly surround thefurnaceentrance above the ash-pit, and in the boilerfront B, I providetwo or moreholes or apertures C, (trumpet mouthed or otherwise,) whichform air=inlets to the chamber A, and in addition to such inlets or inlieu thereof (as occasion may require) I provide two or more other likeair-inlets D in the bottom face of the said chamber at either side ofthe furnace-opening E, or in lieu of the apertures D, I may provide agrid or grids, grating or gratings in the bottom face of the saidair-chamber at either or both sides of the f urnace-opening, asindicated by F in Fig. 1.

From any part of the boiler above the water-level I provide a pipe orpipes G, each fitted at any desired part of its length with a cook orvalve H for the purpose of regulating the force or current of steam, thesaid steam pipe or pipes G being led directly to one entrance orprovided with any number of branch pipes J to lead to a like number ofentrances into the chamber A or to the chamber A of each furnace incases where more than one furnace is provided-as, for instance, in thetype of boiler illustrated by Fig. 1. At the point or points at whichthe said steam pipe or pipes join the air-chamber A a steam-nozzle K isprovided, surrounded by a casing L of any desired formation, but forpreference substantially that shown in Fig. 3 and facing the mouth ofthe said casing L, an opening is formed in the shield-plate or back faceof the chamber A, and inclosing the said opening is fixed upon the saidshield-plate an inlet tube or retort M of any desired length andpreferably slightly bent or curved in a downward direction, so as todirect the induced current of air and steam upon the desired part of thefurnace-fire.

The manner of operation of my invention is as follows: The apertures C,D, or F, as the case may he, would freely admit air into the chamber A,and the jet of steam issuing from the nozzle K and emitted from themouth of the casing L would induce a current of air to be drawn from thechamber A in the direction of the arrows shown in the said chamber inFig. 3, and such air, mingling, with the current of steam, would beforced through the inlet tube or retort M in the direction of the arrowstherein shown, directly onto the furnace-fire, as shown in Fig. 2, andby reason of the air in the chamber A becoming heated before minglingwith the steam perfect combustion of the gases in the furnace would beeffected and the object of my invention be thereby attained.

In cases where the marine or other boiler may have more than twofurnaces the branch steam-pipes J may be provided with other subbranchpipes leading to the several chain bers A, and where desired the saidbranches J and the branches leading from J may each be provided with acock or valve H in addition to or in lieu of the one common cook orvalve H in the steam-pipe Gin order to regulate the force of thesteam-current to each furnace, and in like manner each of the aperturesO, D, or F, as the case may be, maybe provided with means for closure inorder to regulate the inlet of air to accommodate certain conditions ofthe boiler or the class of fuel being used.

It has been found in the experimental tests to which my invention hasbeen subjected that the commonest and most smoky kind of fuel may beused, even pitch, tar, rubber, leather, and other refuse having beentried without the slightest signs of emitted smoke, thus rendering myinvention a great economizer of fuel as well as a smoke-consumer.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be per formed, I declarethat what I claim is In combination with a boiler-fnrnace,a cas ing orshield-plate A formed of one piece and secured to the inner face of theboiler-front around the doorway, thus forming an airchamber, a retort Msecured to said casing and projecting over the bed of fuel, a nozzle Kextending through the boiler-front, a case L securedto said vnozzle andhaving an enlarged open rear end and a contracted front portion in linewith the retort M, and an airinlet, substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

GEORGE GREGORY. Witnesses:

GEORGE THOMAS HYDE, HENRY CONRAD HEIDE.

